In this topic, we think of cool, amazing superpowers, and then make restrictions for them that are so absurd and strict that it kind of defeats the entire purpose of having a superpower.
First one: you can move at lightspeed. However, you can only travel at lightspeed for 100 meters per year. For instance, you could do one 100m teleportation, or else ten mini-teleports, each being 10 meters long, every year. Once you've used up the entire 100 meters of lightspeed travelling, you'll have to wait till new year's day.
What would you do with a single 100m lightspeed spurt each year? Try to win in the Olympics? Well, good luck trying to qualify for them, if you're intending to save the spurt for the finals. They don't accumulate, either, so you can't just wait 4 years and run 400m that year... it's 100m per year, period.
Second one: flying. Only a couple of inches above ground, though, and not longer than 30 seconds. After that, you'll feel dead exhausted, as if you'd just run a marathon. This might be useful if you're trying to cross a minefield, though. Just keep hoping the minefield isn't too large, so you don't run out of strength and drop down in the middle. This might be a nice skill to spook people out though, just like travelling a short distance in lightspeed.
I've got one more. Three super punches. This would be a tremendously fierce punch, an undercut so powerful that it would shoot an elephant onto the orbit of Jupiter. That's the catch, though, you only get three. For your entire life. You'll have many sleepless nights trying to think how to use them. Do you want to murder someone you hate? Well, the police will come after you, and once you've used all 3, they'll be able to arrest you easily. You might as well buy a gun to kill someone, so you can save all 3 punches for the cops, but even then, the 4th cop will catch you anyway. On the other hand, using this punch would dispose of the body easily, so you might get away with it if there are no eye witnesses. But only three times.
What if you've only just discovered you can do super punches, and you don't know how they work yet, so you decide to do a few test punches... well, tough shit, now you've used all three.